CN113864993B - Control method of auxiliary oil return device of multi-split air conditioning system - Google Patents
Control method of auxiliary oil return device of multi-split air conditioning system Download PDFInfo
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- CN113864993B CN113864993B CN202111297770.3A CN202111297770A CN113864993B CN 113864993 B CN113864993 B CN 113864993B CN 202111297770 A CN202111297770 A CN 202111297770A CN 113864993 B CN113864993 B CN 113864993B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000005057 refrigeration Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 17
- 230000002045 lasting effect Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 117
- 230000002427 irreversible effect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000010725 compressor oil Substances 0.000 abstract description 2
- 239000010687 lubricating oil Substances 0.000 description 6
- 239000003507 refrigerant Substances 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 102100025283 Gap junction alpha-8 protein Human genes 0.000 description 1
- 101710086969 Gap junction alpha-8 protein Proteins 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air conditioning systems, in particular to a control method of an auxiliary oil return device of a multi-split air conditioning system. The control method comprises the following steps: s100, starting an air conditioning system, setting an air conditioning mode, identifying the capacity of an internal unit, and determining the starting mode of a compressor; s200, under the first opening mode, the opening mode of the expansion valve is a default mode; s300, opening the first compressor in a second opening mode, and adjusting the opening degree of the expansion valve according to the step S200; after the first preset time, starting the second compressor and adjusting the opening degree of the expansion valve; s400, under the refrigeration mode and the heating mode, when a preset condition is met, the first expansion valve and the second expansion valve exit from the regulation mode and are switched to a default mode. The control method provided by the embodiment of the invention has the following beneficial effects: the problem of under abominable operating mode, can lead to compressor oil return shortage, cause compressor cylinder body bent axle wearing and tearing, produce irreversible damage is solved, the oil return risk has been reduced.
Description
Technical Field
The invention relates to the technical field of air conditioning systems, in particular to a control method of an auxiliary oil return device of a multi-split air conditioning system.
Background
The air conditioning system is applied to daily life and work of people, becomes one of essential electric appliances, and brings great convenience to comfortable life of people. With the development of air conditioning technology, central air conditioners are used in large buildings such as office buildings at present, so that the whole air conditioning and power utilization management of the whole building are facilitated. However, the central air conditioning system with a plurality of air conditioner terminals is structurally and technically more complex and difficult than a household air conditioner in terms of temperature regulation.
The multi-split air conditioner has a complex installation scene due to the fact that the inner and outer split connecting pipes are long, and the compressor returns oil slowly when the multi-split air conditioner operates at a low frequency. Especially under severe working conditions, the oil return of the compressor is in shortage, the crankshaft of the cylinder body of the compressor is abraded, and irreversible damage is generated. The oil return risk of the dual-compressor system is the greatest, and the system is irreversibly damaged due to insufficient oil return of any compressor.
Disclosure of Invention
In order to overcome the problems in the related art, the invention provides a control method of an auxiliary oil return device of a multi-split air conditioning system.
According to an aspect of an embodiment of the present invention, a control method for an auxiliary oil return device of a multi-split air conditioning system is provided, where the multi-split air conditioning system includes at least a first compressor, a second compressor, and a gas-liquid separation device, the auxiliary oil return device is disposed between the gas-liquid separation device and the first compressor and between the gas-liquid separation device and the second compressor, the auxiliary oil return device includes a first oil return pipeline connecting the first compressor and the gas-liquid separation device, and a second oil return pipeline connecting the second compressor and the gas-liquid separation device, a first temperature sensor is disposed on the first oil return pipeline, and a second temperature sensor, a second expansion valve, and a second capillary tube are disposed on the second oil return pipeline of the first expansion valve and the first capillary tube. A filter is arranged between the auxiliary oil return device and the gas-liquid separator, and the control method comprises the following steps:
s100, starting an air conditioning system, setting an air conditioning mode, identifying the capacity of an internal unit, and determining a starting mode of a compressor according to the capacity of the internal unit;
the compressor opening mode includes:
a first opening mode: starting the first compressor;
the second opening mode: sequentially starting a first compressor and the second compressor;
s200, under the first opening mode, the opening modes of the first expansion valve and the second expansion valve are in a default mode;
when a preset condition is met, the first expansion valve and the second expansion valve are switched between a default mode and an adjusting mode;
s300, in a second opening mode, the method comprises the following steps:
s310, starting the first compressor, and adjusting the opening degree of the expansion valve according to the control method of the step S200;
s320, after first preset time, starting a second compressor, detecting oil return temperatures Tci1 and Tci2 through the first temperature sensor and the second temperature sensor, and adjusting the opening degrees of the first expansion valve and the second expansion valve;
s400, under the refrigeration mode and the heating mode, when preset conditions are met, the first expansion valve and the second expansion valve exit from the adjusting mode and are switched to the default mode.
Further, in step S200, the preset conditions include a first condition, a second condition and a third condition;
the first condition is that Tci1 is less than Tai-alpha 1 Lasting for a third preset time;
wherein the content of the first and second substances,
tci 1-oil return temperature;
tai-inner ring temperature;
α 1 -a first target oil return temperature difference;
the second condition is that Tci1 is more than or equal to Tai-beta for the first preset time, wherein beta is the oil return temperature difference;
the third condition is that Tci1 is more than Tai-alpha 1 For a third preset time.
Further, in step S200, the method includes:
s210, in the refrigerating mode, when a first condition is met, the first expansion valve and the second expansion valve are switched to an adjusting mode from a default mode;
s220, under the heating mode, when a third condition is met, the first expansion valve and the second expansion valve are switched to an adjusting mode from a default mode
Further, in step S210, the first expansion valve and the second expansion valve opening degree formula:
Y(ΔT)＝α 1 +(0.1℃)X………………(1)。
further, in step S320, the opening degrees of the first expansion valve and the second expansion valve are adjusted according to the following equations:
Y(ΔT)＝α 2 +(0.2℃)X………………(2)
wherein alpha is 2 Is the second target oil return temperature difference.
Further, α 2 ＝∣Tci1-Tci2∣/2；
Wherein the content of the first and second substances,
tci1 — first return line temperature;
tci 2-second return line temperature.
Further, the default modes of the first expansion valve and the second expansion valve are as follows: the opening degrees of the first expansion valve and the second expansion valve are 60pls;
and when the opening adjusting range of the first expansion valve and the second expansion valve in the adjusting mode is 60-480pls, the opening of the electronic expansion valve is closed to 0pls after the unit is powered off.
Further, the oil return temperature difference alpha is determined 1 The method of (A) 1 ＝Tai-Tci；
Wherein, tai is the inner ring temperature; tci is the oil return temperature.
Further, in step S200, the compressor includes a start-up control phase and a normal control phase;
in the starting control stage of the compressor, the opening degrees of the first expansion valve and the second expansion valve are 480pls;
the compressor carries out step S210 in the normal control stage.
Further, in step S400, the preset condition is the second condition.
The network monitoring method provided by the embodiment of the invention has the following beneficial effects: the problem of under abominable operating mode, can lead to compressor oil return shortage, cause compressor cylinder body bent axle wearing and tearing, produce irreversible damage is solved, the oil return risk has been reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic structural diagram illustrating an auxiliary oil return device of a multi-split air conditioning system according to an exemplary embodiment of the present invention;
fig. 2 is a flowchart illustrating an auxiliary oil return control method of a multi-split air conditioning system according to an exemplary embodiment of the present invention;
fig. 3 is a flowchart illustrating an auxiliary oil return control method of a multi-split air conditioning system according to an exemplary embodiment of the present invention.
Reference numerals:
100-a multi-split air conditioning system, 110-a first compressor, 120-a second compressor, 130-a gas-liquid separation device, 200-an auxiliary oil return device, 210-a first oil return pipeline, 211-a first expansion valve, 212-a first temperature sensor, 213-a first capillary tube, 220-a second oil return pipeline, 221-a second expansion valve, 222-a second temperature sensor, 223-a second capillary tube and 230-a filter.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The principles and spirit of the present disclosure will be described with reference to a number of exemplary embodiments. It is understood that these embodiments are given solely for the purpose of enabling those skilled in the art to better understand and to practice the present disclosure, and are not intended to limit the scope of the present disclosure in any way.
It should be noted that, although the expressions "first", "second", etc. are used herein to describe various modules, steps, data, etc. of the embodiments of the present disclosure, the expressions "first", "second", etc. are only used to distinguish between the various modules, steps, data, etc. and do not indicate a particular order or importance. Indeed, the terms "first," "second," etc. are used interchangeably throughout.
In order to solve the defects existing in the related art, the embodiment of the invention provides an auxiliary oil return device of a multi-split air conditioning system.
According to an aspect of an embodiment of the present invention, an auxiliary oil return device of a multi-split air conditioning system is provided, as shown in fig. 1, the multi-split air conditioning system 100 includes at least a first compressor 110, a second compressor 120 and a gas-liquid separation apparatus 130, and the auxiliary oil return device 200 is disposed between the gas-liquid separation apparatus 130 and the first compressor 110 and the second compressor 120.
The auxiliary oil return device 200 includes a first oil return line 210 connecting the first compressor 110 and the gas-liquid separation apparatus 130, and a second oil return line 220 connecting the second compressor 120 and the gas-liquid separation apparatus 130.
A first temperature sensor 212 is disposed on the first oil return line 210, and a second temperature sensor 222 is disposed on the second oil return line 220.
The first oil return pipeline 210 is connected with the first compressor 110 and the hydraulic separation equipment 130, the second oil return pipeline 220 is connected with the second compressor 120 and the hydraulic separation equipment 130, the first oil return pipeline 210 and the second oil return pipeline 220 are respectively provided with a first temperature sensor 212 and a second temperature sensor 222, the oil return temperatures of the two oil return pipelines are respectively measured, and the oil return of the air conditioning system is controlled according to the oil return temperatures.
Through the auxiliary oil return device of the multi-split air conditioning system with the structure, the problems that the compressor is in oil return shortage under severe working conditions, the crankshaft of the cylinder body of the compressor is abraded, and irreversible damage is generated are solved, and the oil return risk is reduced.
Further, a first expansion valve 211 and a first capillary tube 213 are provided in the first oil return line 210. A second expansion valve 221 and a second capillary tube 223 are disposed on the second oil return line 220.
The first expansion valve 211 and the second expansion valve 221 are preferably electronic expansion valves, and the electronic expansion valves are used for adjusting oil return flow under different scene conditions (the electronic expansion valves are in a default mode after the unit is powered on, the opening degree is 60pls, and if the opening adjusting range of the opening adjusting mode is 60-480pls, the opening degree of the electronic expansion valves is closed to 0pls after the unit is powered off).
The first capillary tube 213 and the second capillary tube 223 are used for completely gasifying the liquid refrigerant mixed in the lubricating oil into a gaseous refrigerant before entering the electronic expansion valve through pressure drop, so as to avoid errors generated when the electronic expansion valve adjusts the flow of the lubricating oil, delay the oil return rate and enable the oil return to be more stable. The capillary specification is preferably 2.6 × 1.3 × 500mm, with reference to the current model gas bypass specification.
Further, a filter 230 is disposed between the auxiliary oil return device 200 and the gas-liquid separator 130.
The filter 230 functions to filter impurities in the lubricating oil.
A control method for auxiliary oil return of a multi-split air conditioning system is used for controlling an auxiliary oil return device of the multi-split air conditioning system, and comprises the following steps:
s100, starting an air conditioning system, setting an air conditioning mode, identifying the capacity of an internal unit, and determining a starting mode of a compressor according to the capacity of the internal unit;
the compressor opening mode includes:
the first opening mode: turning on the first compressor 110;
the second opening mode: sequentially starting the first compressor 110 and the second compressor 120;
recognizing the capacity code of each internal unit through a control device of an external unit of the air conditioning system;
when the starting capacity of the internal machine is less than or equal to 50 percent, a first starting mode is implemented;
when the starting capacity of the internal machine is larger than 50%, the second starting mode is implemented.
Each indoor unit connected with the outdoor unit in the multi-split air-conditioning system has an independent capacity code (for example, 22 indoor units represent 2.2 kW), the outdoor unit main control board can recognize the capacity code, and when one or more indoor units are started, the outdoor unit main control board can automatically recognize the capacity code of the indoor unit and calculate the starting capacity of the indoor unit.
The air conditioning mode includes: a cooling mode and a heating mode;
s200, in the first opening mode, the opening modes of the first expansion valve 212 and the second expansion valve 222 are default modes;
s210, in a refrigeration mode:
s211, when Tci1 is less than Tai-alpha 1 When the first preset time is continued, the first expansion valve and the second expansion valve are switched to an adjusting mode from a default mode;
wherein the content of the first and second substances,
tci 1-oil return temperature;
tai-inner loop temperature;
α 1 -a first target oil return temperature difference.
The oil return temperature is detected by an oil temperature bulb on the oil return branch, and the inner ring temperature is detected by an inner ring temperature sensor. The temperature of the inner ring directly influences the evaporation temperature of the evaporator, the higher the temperature of the inner ring is, the higher the evaporation temperature is, the higher the air suction temperature is, the lower the evaporation temperature is, the lower the air suction temperature is, the higher the oil return temperature is, and the lower the air suction temperature is. Therefore, the oil quantity on the oil return branch can be judged according to the difference value between the oil return temperature and the inner ring temperature. Is provided withA target oil return temperature difference alpha 1 If the inner ring temperature Tai-the oil return temperature Tci is more than alpha 1 The oil return quantity on the oil return branch is small. Wherein, tai is the inner ring temperature; tci is the oil return temperature.
And an electronic expansion valve on the oil return branch is opened (gradually increased from 60 pls), and the oil return branch starts to return oil.
The first expansion valve 212 and the second expansion valve 222 have opening degree formulas:
Y(ΔT)＝α 1 +(0.1℃)X………………(1)
y (Delta T) represents the difference between the actually measured inner ring temperature Tai and the oil return temperature Tci, and alpha 1 And the target oil return temperature difference inner ring temperature Tai-oil return temperature Tci is represented, x represents the step number of the electronic expansion valve adjustment, and the minimum opening degree of the single adjustment is 1pls.
The formula (1) is a proportional relation for controlling the opening of the electronic expansion valve by actually measuring the difference between the oil return temperature difference and the target oil return temperature difference after the electronic expansion valve enters the adjusting mode. The larger the temperature difference is, the larger the number of steps for opening the electronic expansion valve is.
α 1 The target oil return temperature difference is represented, and the determination method is to determine the difference value between the inner ring temperature Tai and the oil return temperature Tci as a target value. Alpha at 10 ℃ < alpha 1 ＜20℃，α 1 The value range is obtained according to actual test experience, and the value is finally an optimal value.
S212, when Tci1 is more than or equal to Tai-beta for the first preset time, the first expansion valve 212 and the second expansion valve 222 exit the adjusting mode and are switched to a default mode;
wherein, the beta-oil return temperature difference;
beta is more than 0 ℃ and less than or equal to 5 ℃, and the value range of the beta is obtained according to actual test experience, and the value is finally an optimal value.
If the oil return temperature difference is less than or equal to beta and lasts 120s, the lubricating oil quantity on the oil return branch is sufficient, the mixed refrigerant quantity is small, the requirement of the unit can be met, the electronic expansion valve enters a default mode, and the opening degree is maintained at 60pls.
S220, in the heating mode:
s221, when Tci1 is less than Tai-alpha 1 When the second preset time is continued, the first expansion valve and the second expansion valve are switched to an adjusting mode from a default mode;
theoretical analysis and refrigeration, wherein the second preset time for the heating to continue is 60s, the first preset time for the refrigeration to continue is 120s, and considering that the temperature of a heating outer ring is relatively low, the frequency of the compressor can be increased, more oil can be discharged, the oil shortage risk is higher than that of a refrigeration mode, and therefore the adjustment mode is entered in advance for the duration of 60 s.
The compressor comprises a starting control phase and a normal control phase;
in the start-up control stage of the compressor, the opening degrees of the first expansion valve 211 and the second expansion valve 221 are 480pls;
under the bad working condition of the outer ring, the flow rate of the refrigerant is low, if the compressor is started instantly, oil is discharged more, oil return is slow, the oil quantity of lubricating oil of the compressor is insufficient, and the electronic expansion valve needs to be opened to the maximum opening degree to supplement oil return until the compressor is stopped.
The compressor carries out step S221 in the normal control phase.
The opening degree regulating formula of the electronic expansion valve is as follows:
Y(ΔT)＝α 2 and (0.05 ℃) X, Y (delta T) represents the difference value of the actually measured inner ring temperature Tai-oil return temperature Tci, alpha represents the target oil return temperature difference inner ring temperature Tai-oil return temperature Tci, X represents the number of steps of the electronic expansion valve adjustment, and the minimum opening degree of the single adjustment is 2pls.
Because the heating working condition is lower than the outer ring of the refrigeration working condition, the flow velocity of the refrigerant is low, the adjustment coefficient of the electronic expansion valve is reduced, the number of steps needing to be opened for heating by the same oil return temperature difference is 2 times of that of refrigeration, and the minimum opening degree is adjusted to be 2pls once, so that the oil return is increased.
S222, when Tci1 is larger than or equal to Tai-beta for the first preset time, the first expansion valve and the second expansion valve are switched to a default mode;
if the oil return temperature difference is less than or equal to beta and lasts 120s, the lubricating oil quantity on the oil return branch is sufficient, the mixed refrigerant quantity is small, the requirement of the unit can be met, the electronic expansion valve enters a default mode, and the opening degree is maintained at 60pls.
S300, in a second opening mode, the method comprises the following steps:
s310, starting the first compressor 110, and adjusting the opening degree of the expansion valve according to the control method of the step S200;
s320, after a third preset time, starting the second compressor 120, and detecting oil return temperatures Tci1 and Tci2 through the first temperature sensor 212 and the second temperature sensor 222, wherein the opening degree adjustment formulas of the first expansion valve 211 and the second expansion valve 221 are as follows:
Y(ΔT)＝α 2 +(0.2℃)X………………(2)
wherein alpha is 2 A second target oil return temperature difference; y (DeltaT) represents the measured oil return temperature Tci1 or Tci2, alpha 2 Representing the target value Tci1-Tci 2/2, x represents the number of steps of the adjustment of the electronic expansion valve, the minimum opening of a single adjustment being 1pls.
The third preset time is 2.5 minutes to 3.5 minutes, and preferably 3 minutes. The electronic expansion valve was adjusted to steady state within 3 minutes. After 3 minutes, the second compressor 120 is started, and the first temperature sensor 212 and the second temperature sensor 222 detect the oil return temperatures Tci1 and Tci2, and at this time, the adjustment formula of the opening degrees of the first expansion valve 211 and the second expansion valve 221 is formula (2).
The system calculates the difference between the oil return temperatures Tci1 and Tci2, takes | Tci1-Tci2 | 2 as a target value, the opening degrees of the first expansion valve 211 and the second expansion valve 221 are controlled around the target value, if the actually measured oil return temperature is larger than the target value, the opening degree of the electronic expansion valve is reduced, and if the actually measured oil return temperature is smaller than the target value, the opening degree of the electronic expansion valve is increased.
S400, in a refrigerating mode and a heating mode, when Tci1 is larger than or equal to Tai-beta and lasts for the first preset time, the first expansion valve 211 and the second expansion valve 221 exit from the adjusting mode and are switched to a default mode.
When the starting capacity of the internal machine is more than 50%, the first compressor 110 is started first, and then the second compressor 120 is started, so that the damage to the cylinder body of the compressor caused by instantaneous oil return shortage due to simultaneous starting of the compressors is prevented. And one compressor is started first, and after the oil return is stable, the second compressor is started again, so that the oil return has a certain buffering effect. And meanwhile, the opening degrees of the electronic expansion valves 1 and 2 are equalized by taking the Tci1-Tci2 |/2 as a target value, and the oil return amounts of the presses 1 and 2 are also equalized.
Specifically, the control method described above is explained by the following examples.
In the refrigeration mode, the unit is powered on and started, and the electronic expansion valve of the oil return branch enters the default mode opening degree of 60pls. Setting a target oil return temperature difference alpha 1 =10 ℃, and the oil return temperature difference β =5 ℃ when the device is out of the adjusting mode.
1. The system detects that the oil return temperature =5 ℃ and the inner ring temperature =20 ℃. The system automatically judges:
(1) The oil return temperature =5 ℃ and the inner ring temperature =20 ℃ to 10 ℃ and the operation is continued for more than 120 s;
the electronic expansion valve enters an adjusting mode according to Y (delta T) = alpha 1 Adjusting the opening degree by X at 0.1 deg.C:
measured return oil temperature difference Y (Δ T): if 15 ℃ =10 ℃ +0.1 ℃x50 pls, the electronic expansion valve needs to be opened by 50pls, and then is actually opened by 110pls.
2. The system detects that the oil return temperature =15 ℃ and the inner ring temperature =20 ℃, and the system automatically judges:
(1) The oil return temperature =15 ℃ or more and the inner ring temperature = 20-5 ℃ for continuously running for more than 120 s;
the electronic expansion valve EEV exits the regulation mode and reenters the default mode, and the opening degree returns to 60pls.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the wellbore arrangements described above and illustrated in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (7)
1. The utility model provides a control method of supplementary oil return device of multi-split air conditioning system, multi-split air conditioning system (100) includes at least first compressor (110), second compressor (120) and gas-liquid separation equipment (130), supplementary oil return device (200) set up in gas-liquid separation equipment (130) with first compressor (110), between second compressor (120), supplementary oil return device (200) including connect first compressor (110) with first oil return line (210) of gas-liquid separation equipment (130) and connect second compressor (120) with second oil return line (220) of gas-liquid separation equipment (130) be equipped with first temperature sensor (212), first expansion valve (211) and first capillary (213) on first oil return line (210), be equipped with second temperature sensor (222), second expansion valve (221) and second capillary (223) on second oil return line (220), be equipped with its characterized in that filter (230) between supplementary oil return device (200) and gas-liquid separation equipment (130), the control method includes:
s100, starting an air conditioning system, setting an air conditioning mode, identifying the capacity of an internal unit, and determining a starting mode of a compressor according to the capacity of the internal unit;
the compressor opening mode includes:
a first opening mode: starting a first compressor;
the second opening mode: sequentially starting a first compressor and a second compressor;
s200, under the first opening mode, the opening modes of the first expansion valve and the second expansion valve are in a default mode;
when a preset condition is met, the first expansion valve and the second expansion valve are switched between a default mode and an adjusting mode;
the preset conditions comprise a first condition, a second condition and a third condition;
the first condition is that Tci1 is less than Tai-alpha 1 Lasting for a first preset time;
wherein, the first and the second end of the pipe are connected with each other,
tci 1-oil return temperature;
tai-inner ring temperature;
α 1 -a first target oil return temperature difference;
the second condition is that Tci1 is more than or equal to Tai-beta for the first preset time, wherein beta is an oil return temperature difference of which the temperature is more than 0 ℃ and less than 5 ℃;
the third condition is that Tci1 is more than Tai-alpha 1 Lasting for a second preset time;
s210, in the refrigeration mode, when a first condition is met, switching the first expansion valve and the second expansion valve from a default mode to an adjustment mode;
s220, under the heating mode, when a third condition is met, switching the first expansion valve and the second expansion valve from a default mode to an adjustment mode;
s300, in a second opening mode, the method comprises the following steps:
s310, starting the first compressor, and adjusting the opening degree of the expansion valve according to the control method of the step S200;
s320, after first preset time, starting a second compressor, detecting oil return temperatures Tci1 and Tci2 through the first temperature sensor and the second temperature sensor, and adjusting the opening degrees of the first expansion valve and the second expansion valve;
s400, under the cooling mode and the heating mode, when a second condition is met, the first expansion valve and the second expansion valve exit the adjusting mode and are switched to the default mode.
2. The control method of an auxiliary oil return device of a multi-split air conditioning system as recited in claim 1,
in step S210, the first expansion valve and the second expansion valve opening degree formula:
Y(ΔT)＝α 1 ＋（0.1℃）X………………（1）。
3. the control method of an auxiliary oil return device of a multi-split air conditioning system as recited in claim 1,
in step S320, the opening degrees of the first expansion valve and the second expansion valve are adjusted by the following equations:
Y(ΔT)＝α 2 ＋（0.2℃）X………………（2）
wherein alpha is 2 Is the second target oil return temperature difference.
4. The control method of an auxiliary oil return device of a multi-split air conditioning system as recited in claim 3,
α 2 =∣Tci1-Tci2∣/2；
wherein, the first and the second end of the pipe are connected with each other,
tci1 — first return line temperature;
tci2 — second return line temperature.
5. The control method of an auxiliary oil return device of a multi-split air conditioning system as recited in claim 1,
the default modes of the first expansion valve and the second expansion valve are as follows: the opening degrees of the first expansion valve and the second expansion valve are 60pls;
and when the opening adjusting range of the first expansion valve and the second expansion valve in the adjusting mode is 60-480pls, the opening of the electronic expansion valve is closed to 0pls after the unit is powered off.
6. The control method of the auxiliary oil return device of a multi-connected air conditioning system as recited in claim 1,
determining the oil return temperature difference alpha 1 The method of (A) 1 =Tai-Tci；
Wherein, the first and the second end of the pipe are connected with each other,
tai is the inner ring temperature;
tci is the oil return temperature.
7. The control method of an auxiliary oil return device of a multi-split air conditioning system as recited in claim 1,
in step S200, the compressor includes a start-up control phase and a normal control phase;
in the starting control stage of the compressor, the opening degrees of the first expansion valve and the second expansion valve are 480pls;
the compressor performs step S210 in the normal control stage.
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| CN103673398B (en) * | 2012-09-07 | 2015-12-16 | 珠海格力电器股份有限公司 | The oil return condition detection method of compressor return oil system and compressor |
| CN104729151B (en) * | 2013-12-23 | 2017-06-20 | 珠海格力电器股份有限公司 | The processing method and system of the compressor return line failure of air-conditioning system |
| CN104457031A (en) * | 2014-09-30 | 2015-03-25 | 广东志高暖通设备股份有限公司 | Multi-split air conditioning system and oil balancing devices and control method of multi-split air conditioning system |
| CN106288520A (en) * | 2016-08-02 | 2017-01-04 | 珠海格力电器股份有限公司 | A kind of compressor oil return control device, control method and air-conditioning |
| CN106839330B (en) * | 2017-03-03 | 2020-01-07 | 广东美的暖通设备有限公司 | Oil balance control method and device and multi-split air conditioning system |
| CN110440402B (en) * | 2019-07-02 | 2021-09-21 | 青岛海尔空调电子有限公司 | Air conditioner and oil return control method thereof |
| CN110332667B (en) * | 2019-07-11 | 2020-07-14 | 珠海格力电器股份有限公司 | Self-repairing control method, device and system for failure of oil return temperature sensing bulb |
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Effective date of registration: 20220926 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant after: NINGBO AUX ELECTRIC Co.,Ltd. Applicant after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant before: NINGBO AUX ELECTRIC Co.,Ltd. Applicant before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |
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